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教学目的通过复习帮助学生进一步理解两步计算应用题的结构和数量关系,进一步掌握两步应用题的分析思路和解答方法。一、分层训练,提高解题技能第一层次:基本训练提问题、填条件1.有红花12朵,黄花6朵____?2.____,____,一共有多少个同学?第二层次:回顾整理,理清思路。例:幼儿园买来12千克水果糖,13千克奶糖,分给小朋友15千克,还剩多少千克?提问:1.这题知道什么条件,求什么问题?2.要求还剩多少千克,要先求什么?3.怎样列式解答?解答后讨论:两步计算应用题是怎样分析和解答的呢?学生经过讨论整理出:
Teaching Objectives Through the review to help students further understand the two-step calculation of the structure and the relationship between the number of questions, to further grasp the two-step analysis of the problem analysis and answer. First, stratification training to improve the problem-solving skills The first level: the basic training to ask questions, fill in the conditions 1. There are 12 red flowers, 6 yellow flowers ____? 2 .____, ____, a total of how many students? The second level : Review, organize, clear your thinking. Example: Kindergarten bought 12 kilograms of fructose, 13 kilograms of milk, 15 kilograms of children, left the number of kilograms? Question: 1. This question knows what conditions, seeking any questions? 2. How many kilograms left, What to ask? 3. How to formulate answers? After the discussion: two-step calculation of application questions is how to analyze and answer it? Students after discussion sorted out: